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Data link DL9 (master station) function
11-3 Required transfer time and its timing
[1] Required transfer time
Required time (T) for the data link DL9 master station to communicate with all slave stations.
T=
N
153.6
+1.5P+
(ms)
N: Total amount of link points
(get the value by multiple number of data link bytes with 8 points)
P: Number of connected slave stations
α: Data exchange time between the JW-32CUM1 general purpose communication section (data link DL9
master station) and the control section: (about 6 ms in max).
I/O
processing
I/O
processing
JW-32CUM1
Master station
PC I/O cycle
(control section)
PC processing
PC processing
Data exchange
To slave station 1
Master station
(general purpose
communication section) Sending
To slave station 2 To slave station 3
Receiving
Sending
Slave station 1
Receiving
Tc
Slave station 2
Remarks
- When the JW-32CUM1 (master station) is a master station, the data exchange with the JW32CUM1 control section is once per communication cycle.
I/O processing
Master station
PC I/O cycle
Data exchange
(Communication cycle)
11
Data
exchange
Do not exchange
data here
(1 cycle communication)
Waiting time
- Communication cycle starts from data exchange with the control section. Thus, waiting time
occurs in each communication cycle.
- When a slave station has an error, the JW-32CUM1 (master station) operates an error recovery
procedure in every 3 communication cycles. In this case, error recovery time TER becomes longer.
TER = 4P' ms [P': Number of error slave stations]
11-10